Abstract
We analyse the exclusive channel p (p) over bar -> gamma pi(O); assuming handbag dominance. The soft parts are parametrized in terms of CGLN amplitudes for the q (q) over bar -> gamma pi(O) transition and form factors for the p (p) over bar -> q (q) over bar ones; the latter represent moments of Generalized Distribution Amplitudes. We present a combined fit to Fermilab data from E760 taking ...
Abstract
We analyse the exclusive channel p (p) over bar -> gamma pi(O); assuming handbag dominance. The soft parts are parametrized in terms of CGLN amplitudes for the q (q) over bar -> gamma pi(O) transition and form factors for the p (p) over bar -> q (q) over bar ones; the latter represent moments of Generalized Distribution Amplitudes. We present a combined fit to Fermilab data from E760 taking simultaneously into account information from other exclusive reactions, especially from p (p) over bar -> gamma gamma data. Overall a nicely consistent picture emerges, such that one can hope, that our theoretical analysis will be reliable also for the kinematics of GSI/FAIR, which, hopefully, will provide much more precise and complete data. Consequently, data from this facility should improve our knowledge both on the proton-antiproton distribution amplitudes and the pion production mechanism.
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